Enter Noise Figure (dB), Noise Temperature (K), or Noise Factor to calculate other
equivalent parameters
Noise Figure, Noise Factor and Noise Temperature are all figures of merit to evaluate
the sensitivity of a given system to random and uncorrelated fluctuations adding
to the signal of interest. There are two mechanisms that contribute to the total
noise of a system: charge carrier velocity fluctuations (thermal noise) and fluctuations
in the number of charge carriers (shot noise). Both thermal and shot noise are purely
random and have a Gaussian amplitude distribution. Generally, noise power per unit
bandwidth is uniform with frequency but excess (or flicker or 1/f) noise does not
have a uniform power spectral distribution. Shot noise can become dependent on frequency
when the period of the signal approaches the charge carrier transit time within
the device. Thanks to Hadrien Theveneau for improving on my original version of
this calculator.
The Noise Factor is the ratio of the signal-to-noise ratio at the input to the
signal-to-noise ratio at the output
SNRinSNRout.
The Noise Figure (dB) is
10⋅log10(Noise
Factor).
The Noise Temperature (K) is 290⋅(Noise Factor−1).